I'm assuming that you know what a controller is, but let me know if you don't.

Have you been able to access the 218 configuration program yet? There is an area where you can change the comms configuraiton. This area allows you to make the 218 a controller. I was suggesting that you make this configuration change. Then store the setting and then restart the 218 by removing the power and reinserting.

I am trying to create a phantom input on G65 for the SLS button that will be set as stereo to turn off rear speakers when listening to MQA. I have made another MC200 and set DSP presets to stereo discrere stereo discrete.

When I now select SLS on G65 it displays SLS on display but DSP stays on whatever it was before but the rear and centre do stop so it's obviously doing job. I guess it won't display stereo as there is no audio input on SL2.

One snag I think is if my Humax box is playing a genuine 5.1 output then my DSP settings above will trigger as discrete and I will still get the rears playing.

My only comcern is what the 218 is adding to the g65 output when acting as a SL passthrough. There are loads of settings in the 218 that look like they may further adjust the signal before reaching the DSP's.